package com.mmall.concurrency.example.lockExample;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @Author: liqiang
 * @description: Oh my god!
 * @Date: Created in 22:26 2018/4/4
 * @Modified:
 */
@Slf4j
public class lockExcemple1 {
    // 请求总数
    public static int clientTotal = 5000;

    // 同时并发执行的线程数
    public static int threadTotal = 200;

    public static int a = 0;

    private final static Lock lock = new ReentrantLock();

    public static void main (String[] args) throws Exception {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
//        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i < clientTotal; i++) {
            executorService.execute(() -> {
                try {
                    semaphore.acquire();
                    add();
                    semaphore.release();
                } catch (Exception e) {
                    log.error("exception", e);
                }
//                countDownLatch.countDown();
            });
        }
//        countDownLatch.await();
        executorService.shutdown();
        log.info("count:{}", a);
    }

    private static void add () {
        lock.lock();
        try {
            a++;
        } finally {
            lock.unlock();
        }
    }
}
